题解 | #统计每个用户的平均刷题数#
统计每个用户的平均刷题数
https://www.nowcoder.com/practice/f4714f7529404679b7f8909c96299ac4
select
u.university,
qd.difficult_level,
round(
count(q.question_id) / count(distinct q.device_id),
4
) avg_answer_cnt
from
user_profile u
join question_practice_detail q on u.device_id = q.device_id
join question_detail qd on q.question_id = qd.question_id
where
u.university="山东大学"
group by
u.university,
qd.difficult_level
order by
u.university,
qd.difficult_level;
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